# ISD Link vs SUNNYSKY

The clearest difference is iOS requirement: SUNNYSKY at 12.4 against ISD Link's 16.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ISD Link ships an update fortnightly, SUNNYSKY every 9 days. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | ISD Link | SUNNYSKY |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.1 (26 ratings)](https://appshunter.io/ios/app/isd-link/id1568620244/reviews)** | — |
| Number of ratings | **26** | — |
| Positive reviews | 20.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Free | — |
| Size | 3 MB | 5 MB |
| Requires iOS | 16.6 | **12.4** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳艾斯特创新科技有限公司](https://appshunter.io/developer/1405370693) | [翔 任](https://appshunter.io/developer/1680645716) |

## What reviewers say

### ISD Link

[App page](https://appshunter.io/ios/app/isd-link/id1568620244)

This app allows interaction with various smart devices. It prioritizes user privacy by saving all data locally and not collecting personal information. Bluetooth is required for device scanning and connection.

**Highlights:** Smart device interaction, Local data saving, No account registration, Bluetooth connectivity, Supports numerous device models

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### SUNNYSKY

[App page](https://appshunter.io/ios/app/sunnysky/id6472908945)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ISD Link free?

ISD Link is free to download, with no in-app purchases.

### Is SUNNYSKY free?

SUNNYSKY is free to download, with no in-app purchases.

### Do ISD Link or SUNNYSKY have ads?

Neither ISD Link nor SUNNYSKY shows ads.

### Which is updated more often, ISD Link or SUNNYSKY?

ISD Link ships an update fortnightly, and SUNNYSKY every 9 days. Most recently, ISD Link was updated on November 7, 2026 and SUNNYSKY on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*